Great tip.. Odd as It sounds (even to Me). When I was about 10 years old I grew up along the head waters of the Clarks Fork river. There were some large patches of Nettles within a little 200' walk to them. An Uncle told Me if I'd start slow, "just a hand and part of an arm and work up, I'd become resistant to Nettles. I started increasing more skin till I could walk around in them in swim trunks and have on important ill effects. I have been resistant to Nettles since, I'm 65. True "not recommended" Story.